C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/26
C09K 8/20 (2006.01)
Patent
CA 1246855
Abstract of the Disclosure Disclosed is a composition including a water swellable clay, and particularly a montmorillonite clay, such as bentonite; xanthan gum; and one or more additional water-soluble gums, for example, guar, dextran, acacia or locust bean. The xanthan gum to- gether with one or more additional water-soluble gums prevents montmorillonite clay composition from sub- stantial coagulation or flocculation upon contact with salt contaminated water even in high concentra- tions of, for example, 15-40% by weight salt. It has been found that xanthan gum in an amount of 0.1-20% based on the weight of the water-swellable clay, i.e. bentonite, in the composition together with one other water soluble gum, for example guar gum, dextran gum, acacia gum and/or locust bean gum in an amount of 1.0-10% based on the weight of bentonite in the compo- sition will provide a clay composition capable of excellent stability without component separation in salt contaminated water. The composition is par- ticularly useful as an additive to compositions used as stable drilling fluids in rotary drilling, and as lagoon and landfill sealants.
488536
American Colloid Company
Smart & Biggar
LandOfFree
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